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10 Cisco 3600 Series Memory Upgrade Conﬁguration Note

Upgrading DRAM

Cisco 3640 DRAM

The Cisco 3640 router contains four 72-pin SIMM sockets or banks for DRAM, numbered 0 through

3. (See Figure 5.) Each socket can be ﬁlled with a single 32-bit-wide, 72-pin DRAM SIMM. You

can conﬁgure DRAM in software as a mixture of shared memory, which is used for data transmitted

or received by network modules and WAN interface cards, and primary or main memory, which is

reserved for the CPU. For further information, refer to the Cisco IOS conﬁguration guides and

command references.

You can conﬁgure DRAM in the Cisco 3640 router to be either 32 bits wide or 64 bits wide. The

64-bit mode can use both single-bank and dual-bank SIMMs. To use 64-bit mode, you must install

DRAM SIMMs in pairs of the same size.

Note In 32-bit mode, the router performs approximately 20 percent slower than when DRAM is

conﬁgured for 64-bit mode.

Figure 5 Cisco 3640 DRAM SIMM Locations

Only certain combinations of DRAM SIMMs are permitted. These combinations are shown in

Table 2 for 64-bit conﬁgurations, and in Table 3 for 32-bit conﬁgurations. (Memory conﬁgurations

that are too small to run the Cisco IOS software are not shown.)

Follow these rules to use 64-bit mode DRAM conﬁguration:

• The SIMMs in sockets 0 and 1 must be the same size (in MB) and have the same access time (in

nanoseconds).

• The SIMMs in sockets 2 and 3 must be the same size and have the same access time.

• The size of the SIMMs in sockets 2 and 3 must be less than or equal to the size of the SIMMs in

sockets 0 and 1.

H7081

DRAM SIMMs

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Cisco 3620 Installationsanleitung Seite 10